Perhaps you should try some spelling variations:
kyoung yun » young yun, kyoung yang, hyoung gun
cost data » test data
yang yang » wang yang, wang yan
yi kyoung » kim kyoung
wei yang » pei yang, wei wang, wei yang's
day your » pay your, way your, say you
way you » why you

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((wei yang) or (((yang yang) or (dong sin)))) ((day your) or (way you)) cost data yi kyoung yun ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((wei yang) OR (((yang yang) OR (dong sin)))) ((day your) OR (way you)) cost data yi kyoung yun ;.
• Adding a wildcard symbol may retrieve word variants: ((wei yang) or (((yang yang) or (dong sin)))) ((day your) or (way you)) cost data yi kyoung yun ;*.